Magnetic Slot Reader - IBM 3278 Series Maintenance Information

There are two configurations of the logic for the 3278
Display Station. The first is the (D) type, shown in
Figures 1-1,4-6, and 4-7. Three base logic cards are
used in this configuration: base 1 (G2), base 2 (F2),
and base 3 (E2). The second configuration, the (M)
type, shown in Figures 1-2,4-8, and 4-9, has two base
cards: base 1 (G2) and base 2 (F2). Note the new
locations of the feature cards when present with the
second configuration.
The 3278 Display Station Model 5 has the (M) config-
uration only, and can display either an 80- or a 132-
character line. The offline test describes the method
for testing and aligning the Model 5.
The (D) type basic logic is packaged on three cards,
one 2WX3H and two 4WX3H, and contains basic
functions as follows:
Base card 1-01A/A1G02
Interface to coax, command decode and gates, and
paths to features.
Base card 2 - 01A/A 1 F02
Storage, counters, and storage control.
Base card 3 - 01A/A 1 E02
Character generator, dot character line and row
counters, video serializer, and control.
The (M) type base logic is packaged on two cards,
one 2WX3H and the other 4WX3H. Most of the
basic functions are contained in the 4W card, which
is located at 01 A/A 1 F2. The interface to the coax
cable, the dot counter, and the video serializer are
located on the card in 01A!A1G2.
1.1.1 Magnetic Slot Reader
The magnetic slot reader (MSR) and the magnetic
hand scanner (MHS) accessories allow the 3278 to
enter data recorded on a magnetic stripe. They
attach to the display station through a cable. The
magnetic slot reader reads information when a
magnetic striped card is passed through a slot in the
reader. The magnetic hand scanner reads data when
it is passed over a magnetic stripe. (The magnetic
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